降低轻油泵房油蒸气浓度的措施

分析了轻油泵房产生油蒸气的原因,介绍了有关降低轻油泵房油蒸气应采取的措施。     

响洪甸抽水蓄能电站岩塞爆破水工模型试验与实践

比较了响洪然抽水蓄能电站水下岩塞爆破水工模型试验和原型观测的结果，说明岩塞爆破水工模型试验能较好地模拟集碴坑的堆碴形态和闸门井涌浪等。     

Energy efficient control of variable speed pumps in complex building central air-conditioning systems

This paper presents the optimal control strategies for variable speed pumps with different configurations in complex building air-conditioning systems to enhance their energy efficiencies. Through a detailed analysis of the system characteristics, the pressure drop models for different water networks in complex air-conditioning systems are developed and then used to formulate an optimal pump sequence control strategy. This sequence control strategy determines the optimal number of pumps in operation taking into account their power consumptions and maintenance costs. The variable speed pumps in complex air-conditioning systems can be classified into two groups: the pumps distributing water to terminal units and pumps distributing water to heat exchanges. The speeds of pumps distributing water to terminal units are controlled by resetting the pressure differential set-point using the online opening signals of water control valves. The speeds of pumps distributing water to heat exchanges are controlled using a water flow controller. The performances of these strategies are tested and evaluated in a simulated virtual environment representing the complex air-conditioning system in a super high-rise building by comparing with that of other reference strategies. The results showed that about 12-32% of pump energy could be saved by using these optimal control strategies.     

泵过流通道的整体设计思想

本文旨在讨论泵吸水室、叶轮、压水室三者的流道形式和相互关系,试图探求获得最佳匹配设计,以提高泵的性能。进而提出了泵过流通道整体设计的思想。     

分阶段质调节下供热循环水泵最优运行方式的确定

针对闭式供暖系统采用分阶段经济流量比质调节问题,提出了在该流量小于单台循环水泵能够提供最大流量时,两台并联水泵可能有的多种运行方案;通过算例得出各个运行方案能耗大小的排序,并经过综合分析给出最优运行方式;强调了若将该最优运行方案应用于开式系统时并不一定是最优的结果。     

水厂加压泵站自动化系统

本文以柳州市旧机场加压泵站为例,介绍了一种针对加压泵站自动化的控制系统,为以后加压泵站自动化控制设计开辟新思路。     

基于灰色理论的机床润滑泵泵芯磨损可靠性预测

为了掌握机床设备润滑泵泵芯磨损的变化规律,分析集中润滑系统的可靠性。基于灰色预测的方法对润滑泵泵芯磨损进行预测。建立了灰色预测G(1,1)模型;然后,结合润滑泵2000 h磨损试验数据进行预测;通过模型得到机床润滑泵泵芯2000 h后的5个磨损量。通过将试验数据与预测数据进行对比,验证了灰色预测模型的准确性和可行性。结果表明:利用灰色预测模型能获得后期润滑泵泵芯的磨损情况,且该方法的预测结果符合磨损相关规律,对后续机床设备润滑泵的稳定运行及泵芯的修理和更换具有参考意义。     

一种引入停止机制的改进爬山算法

针对爬山法(hill-climbing searching,HCS)在最大功率点(maximum power point,MPP)处存在的转速振荡和风速变化导致搜索方向误判的问题,提出1种具有扰动停止机制的改进爬山算法。该算法不仅继承了变步长爬山法快速搜索至MPP附近的优点,还具有MPP检测和停止机制。在风机跟踪至MPP附近时,该机制不仅可以有效降低转速振荡对风机系统机械部件的磨损,而且克服了算法停止机制生效后风速再次变化时对搜索方向判断的干扰,从而进一步提高了风能捕获效率。在简化风电系统模型的基础上,仿真结果验证了该算法的有效性和优越性。     

污水排放系统优化控制机理及策略

综合分析了污水排放系统各环节运行工况,得出通过优化机组组态、提升运行效率及实时优化控制降低机泵扬程实现大幅度节电运行的理论依据,并提出了基于互联网的优化控制策略.用网络构成上层协调控制环和泵站现场计算机实时控制环配合实现节能优化排放.给出了全局优化控制系统的结构图及控制信号流程图.同时指出本优化控制策略可解决常规网络控制可靠性差的问题,有利于系统中的机泵"避峰垫谷"运行,发挥调节、平衡电网负荷作用.典型工况运行结果表明理论计算式具有应用价值.